As Zhu Heling struggled to wrench his seven-foot war-cleaver free from the shattered Carrara marble, Qiao Ming reached into the inner fold of his grey linen tunic.
His calloused fingers withdrew the Folded brass star-compass—the sacred instrument of the Fathom-Scribes that had survived seven hundred days of water-surveying in the deepest trenches of the sunken realm. The disc was four inches in width, forged from cold-pressed sea-bronze, its surface darkened by the rich, oily patina of three ages of water-mapping stewardship.
The instrument was not merely a tool for navigation. It was a physical analog computer forged before the loss of the sky spirit vein. Its outer rim was divided into three hundred and sixty-five degrees and a quarter, with fine-scale subdivisions permitting readings down to a single fathom across ten leagues of open water. The gears within its hub had been hand-lapped with diamond dust, sunk in sperm-whale oil, and sealed within a watertight casing that had never known the touch of sulfur smoke. To hold it was to hold the piled up wisdom of seven dynasties of mapmakers who had charted the drowning of the ancient world.
With a gentle, flicking motion of his wrist, Qiao Ming unfolded the instrument. Three nested fine-scale rings unfolded outward from the central hub with a soft, musical chime of linked brass teeth. Each ring was engraved with twelve hundred tiny graduations, marked in the ancient dot-and-line notation of the First Foundation.
